package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

/**
 * @Author 12629
 * @Description：
 */
public class DelOperation implements IOPeration{


    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书！");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的图书：");
        String name = scanner.nextLine();

        int pos = -1;

        int currentSize = bookList.getUsedSize();
        int i = 0;
        for (; i < currentSize; i++) {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)) {
                pos = i;
                break;
            }
        }

        if(i == currentSize) {
            System.out.println("没有你要删除的图书！");
            return;
        }
        //开始删除
        int j = pos;
        for (; j < currentSize-1; j++) {
            //[j] = [j+1]
            Book book = bookList.getBook(j+1);

            bookList.setBooks(j,book);
        }

        bookList.setBooks(j,null);

        bookList.setUsedSize(currentSize-1);
    }
}